All your burette readings (initial and final), as well as the size of your pipette, must be recorded but on no account of experimental procedure is required. All calculations must be done in your answer book.

(a) Put A into the burette and titrate it against 20.0 cm\(^3\) or 25.0 cm\(^3\) portion of B using methyl orange as indicator. Record the volume of your pipette. Tabulate your burette readings and calculate the average volume of A used. The equation for the reaction is 2NaOH\(_{(aq)}\) + H\(_2\)X\(_{(aq)}\) \(\to\)  2H\(_2\)O\(_{(l)}\) 

 

(b) From your results and the information provided, calculate the;

(i) Concentration of solution B in mol dm\(^{-3}\) 

(ii) concentration of solution A in mol dm\(^{-3}\)

(iii) molar mass of the acid H\(_2\)X. [H = 1, O = 16, Na = 23]